I tried with fabulous several times before, but I always fail with exercise after a while – its really not in my habits at all and I have a strong resentment to it. Any advice from someone who had similar struggles but overcame them?

First of all, I would advise a change of mind set, exercise is an investment in yourself. It helps your body work better for longer. This is important as you only get one! Change mindset from have to, to I get to.
The next thing to do is building exercise into your life, this is the one I am struggling with at the moment. The house is in the middle of decorating, and I am not able to get myself organised. I will have this in order soon.
I am working on the house this is currently my exercise. It is intermittent and a bit boom and bust.
I like moving my body, I want to keep going as long possible 🙂